One vertex per element, one color per generator, with an edge from x to x·s.
(5,6)(7,11)(8,10)(9,12)(13,14,17,21,16,20,18,22)(15,23,26,28,25,19,27,24)(1,2)(3,4)(5,7,9,8)(6,10,12,11)(13,15,18,27,16,25,17,26)(14,19,22,28,20,23,21,24)(2,4)(5,7,9,8)(6,11,12,10)(13,14)(15,24)(16,20)(17,22)(18,21)(19,26)(23,27)(25,28)(5,8,9,7)(6,10,12,11)(13,14)(15,19)(16,20)(17,21)(18,22)(23,25)(24,26)(27,28)A Cayley diagram is a choice, not a fact about the group. Another drawing of this group — in a book, or on a different generating set — may look nothing like this one.